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+<!DOCTYPE html>
+<html lang="de">
+<head>
+<meta charset="UTF-8">
+<title>Psychovisualität — Luminanz vor Chrominanz</title>
+<style>
+  :root {
+    --dark: #1a1a2e;
+    --muted: #6b7280;
+    --soft: #f8fafc;
+    --border: #cbd5e1;
+    --hl: #d63384;
+    --full: #2563eb;
+    --reduced: #7c3aed;
+    --y: #1a1a2e;
+    --cb: #2563eb;
+    --cr: #ef4444;
+    --bar-bg: #e2e8f0;
+  }
+  html, body { margin: 0; padding: 0; background: #fff; font-family: system-ui, -apple-system, sans-serif; color: var(--dark); }
+  body { padding: 30px 40px; }
+  h1 { text-align: center; margin: 0 0 6px; font-size: 1.75rem; }
+  .sub { text-align: center; color: var(--muted); margin-bottom: 24px; font-size: 1.05rem; }
+  .sub strong { color: var(--dark); }
+
+  .compare {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 22px;
+    max-width: 1180px;
+    margin: 0 auto;
+  }
+
+  .col {
+    border: 2px solid;
+    border-radius: 12px;
+    padding: 16px 20px;
+    background: #fff;
+    display: flex;
+    flex-direction: column;
+    gap: 12px;
+  }
+  .col.full    { border-color: var(--full); }
+  .col.reduced { border-color: var(--reduced); }
+
+  .col-head { display: flex; justify-content: space-between; align-items: baseline; }
+  .col-tag {
+    font-size: 0.72rem;
+    font-weight: 700;
+    text-transform: uppercase;
+    letter-spacing: 0.12em;
+    color: var(--muted);
+  }
+  .col-name { font-size: 1.25rem; font-weight: 700; }
+  .col.full .col-name    { color: var(--full); }
+  .col.reduced .col-name { color: var(--reduced); }
+  .col-format {
+    font-family: ui-monospace, monospace;
+    font-size: 0.82rem;
+    color: var(--muted);
+  }
+
+  .preview {
+    border-radius: 8px;
+    overflow: hidden;
+    border: 1px solid var(--border);
+  }
+  .preview svg { display: block; }
+
+  .channels {
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+  }
+  .channel { display: grid; grid-template-columns: 90px 1fr 60px; gap: 8px; align-items: center; font-size: 0.85rem; }
+  .channel-label {
+    font-family: ui-monospace, monospace;
+    font-weight: 700;
+  }
+  .channel-bar { height: 14px; background: var(--bar-bg); border-radius: 3px; overflow: hidden; }
+  .channel-bar .fill { height: 100%; border-radius: 3px; }
+  .channel-bar .fill.y  { background: var(--y); }
+  .channel-bar .fill.cb { background: var(--cb); }
+  .channel-bar .fill.cr { background: var(--cr); }
+  .channel-pct {
+    font-family: ui-monospace, monospace;
+    font-size: 0.78rem;
+    color: var(--muted);
+    text-align: right;
+  }
+
+  .summary-line {
+    display: flex;
+    justify-content: space-between;
+    background: var(--soft);
+    border-radius: 6px;
+    padding: 6px 12px;
+    font-family: ui-monospace, monospace;
+    font-size: 0.85rem;
+    color: var(--dark);
+  }
+  .summary-line strong { color: var(--hl); }
+
+  .verdict {
+    margin-top: 22px;
+    max-width: 1180px;
+    margin-left: auto;
+    margin-right: auto;
+    text-align: center;
+    border: 2px solid var(--hl);
+    border-radius: 12px;
+    padding: 14px 22px;
+  }
+  .verdict-q { font-size: 1.1rem; font-weight: 700; color: var(--hl); }
+  .verdict-a { font-size: 0.93rem; color: var(--dark); margin-top: 4px; }
+  .verdict-a strong { color: var(--hl); }
+</style>
+</head>
+<body>
+  <h1>Psychovisualität — Luminanz vor Chrominanz</h1>
+  <div class="sub">Das Auge sieht <strong>Helligkeit</strong> scharf. <strong>Farbe</strong> darf grob bleiben — und das Bild sieht trotzdem identisch aus.</div>
+
+  <div class="compare">
+
+    <div class="col full">
+      <div class="col-head">
+        <span class="col-name">Ohne Subsampling</span>
+        <span class="col-tag">4:4:4</span>
+      </div>
+      <div class="col-format">jedes Pixel speichert Y · Cb · Cr in voller Auflösung</div>
+
+      <svg class="preview" viewBox="0 0 320 130" preserveAspectRatio="xMidYMid slice">
+        <defs>
+          <linearGradient id="full-sky" x1="0" y1="0" x2="0" y2="1">
+            <stop offset="0%" stop-color="#fde68a"/>
+            <stop offset="55%" stop-color="#fb923c"/>
+            <stop offset="100%" stop-color="#7c3aed"/>
+          </linearGradient>
+        </defs>
+        <rect x="0" y="0" width="320" height="130" fill="url(#full-sky)"/>
+        <circle cx="230" cy="50" r="22" fill="#fef3c7"/>
+        <path d="M0,90 L40,75 L90,87 L140,68 L190,82 L240,66 L290,80 L320,72 L320,130 L0,130 Z" fill="#1e1b4b"/>
+        <path d="M0,108 L60,100 L120,108 L180,98 L240,106 L300,98 L320,103 L320,130 L0,130 Z" fill="#0f172a" opacity="0.7"/>
+      </svg>
+
+      <div class="channels">
+        <div class="channel">
+          <span class="channel-label">Y</span>
+          <div class="channel-bar"><div class="fill y" style="width:100%"></div></div>
+          <span class="channel-pct">100 %</span>
+        </div>
+        <div class="channel">
+          <span class="channel-label">Cb</span>
+          <div class="channel-bar"><div class="fill cb" style="width:100%"></div></div>
+          <span class="channel-pct">100 %</span>
+        </div>
+        <div class="channel">
+          <span class="channel-label">Cr</span>
+          <div class="channel-bar"><div class="fill cr" style="width:100%"></div></div>
+          <span class="channel-pct">100 %</span>
+        </div>
+      </div>
+
+      <div class="summary-line">
+        <span>Datenmenge:</span>
+        <span><strong>100 %</strong></span>
+      </div>
+    </div>
+
+    <div class="col reduced">
+      <div class="col-head">
+        <span class="col-name">JPEG · H.264 Standard</span>
+        <span class="col-tag">4:2:0</span>
+      </div>
+      <div class="col-format">Y voll · Cb &amp; Cr nur in 2×2-Pixel-Blöcken</div>
+
+      <svg class="preview" viewBox="0 0 320 130" preserveAspectRatio="xMidYMid slice">
+        <defs>
+          <linearGradient id="red-sky" x1="0" y1="0" x2="0" y2="1">
+            <stop offset="0%" stop-color="#fde68a"/>
+            <stop offset="55%" stop-color="#fb923c"/>
+            <stop offset="100%" stop-color="#7c3aed"/>
+          </linearGradient>
+        </defs>
+        <rect x="0" y="0" width="320" height="130" fill="url(#red-sky)"/>
+        <circle cx="230" cy="50" r="22" fill="#fef3c7"/>
+        <path d="M0,90 L40,75 L90,87 L140,68 L190,82 L240,66 L290,80 L320,72 L320,130 L0,130 Z" fill="#1e1b4b"/>
+        <path d="M0,108 L60,100 L120,108 L180,98 L240,106 L300,98 L320,103 L320,130 L0,130 Z" fill="#0f172a" opacity="0.7"/>
+      </svg>
+
+      <div class="channels">
+        <div class="channel">
+          <span class="channel-label">Y</span>
+          <div class="channel-bar"><div class="fill y" style="width:100%"></div></div>
+          <span class="channel-pct">100 %</span>
+        </div>
+        <div class="channel">
+          <span class="channel-label">Cb</span>
+          <div class="channel-bar"><div class="fill cb" style="width:25%"></div></div>
+          <span class="channel-pct">25 %</span>
+        </div>
+        <div class="channel">
+          <span class="channel-label">Cr</span>
+          <div class="channel-bar"><div class="fill cr" style="width:25%"></div></div>
+          <span class="channel-pct">25 %</span>
+        </div>
+      </div>
+
+      <div class="summary-line">
+        <span>Datenmenge:</span>
+        <span><strong>50 %</strong></span>
+      </div>
+    </div>
+
+  </div>
+
+  <div class="verdict">
+    <div class="verdict-q">Halbe Datenmenge. Identisches Bild — für dein Auge.</div>
+    <div class="verdict-a">JPEG, H.264, H.265, WebP — alle reduzieren die Farb-Auflösung auf <strong>ein Viertel</strong>. Das ist Psychovisualität: was wir nicht scharf sehen, muss man nicht scharf speichern.</div>
+  </div>
+</body>
+</html>
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